期刊
JOURNAL OF RARE EARTHS
卷 28, 期 2, 页码 221-226出版社
ELSEVIER
DOI: 10.1016/S1002-0721(09)60084-3
关键词
supercritical CO2; TBP-HNO3 complex; TRPO-HNO3 complex; extraction; rare earths
资金
- National Natural Science Foundation of China [20506014]
Direct extraction of metals from solids with complexing agents in supercritical CO2(SC-CO2) has recently attracted interests in separation, purification, recovery, and analysis of metals. In the present study, the static/dynamic extraction of rare earth elements (Nd, Ce) from their oxides (Nd2O3, CeO2) with organophosphorus complexes with HNO3 and H2O in SC-CO2 was investigated. The static extraction efficiency of Nd from Nd2O3 with the tri-n-butylphosphate (TBP)-HNO3 complex could reach 95% under optimized experimental conditions. However, the static extraction efficiency of Nd from Nd2O3 with the trilkyl phosphine oxide (TRPO)-HNO3 complex was less than 10%, and the static extraction efficiency of Ce from CeO2 with the TBP-HNO3 complex was less than 1%. The dynamic extraction efficiency of Nd from Nd2O3 with the TBP-HNO3 complex could reach more than 97%. Effects of parameters were evaluated on the extraction efficiency to ascertain the optimum conditions. This study illustrated the extraction process using the TBP-HNO3 complex in SC-CO2 would be feasible for separation, purification, recovery, and analysis of some rare earth elements from various oxide mixtures.
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